Solution for use in the production of photographic papers, plates, &amp;c.



UNITED STATES Patented June 30, 1903.

PATENT OFFICE.

MAX J OLLES AND LEON LILIENFELD, OF VIENNA, AUSTRIA-HUNGARY.

SPECIFICATION forming part of Letters Patent No. 732,189, dated June 30,1903.

Application filed June 30, 1897. Serial No. 643,022. (No specimens.)

To aZZ whom it may concern:

Beit known that we, MAX Jonas and LEON LILIENFELD, citizens of theEmpire of Austria-Hungary, and both residents of Vienna, in the Empireof Austria-Hungary, have invented a certain new and useful ImprovedSolution for Use in the Production of Photographic Paper, Plates, &c.,of which the following is a full, clear, and exact description.

This invention has for its object to provide an improved solution foruse in the production of photographic paper, plates, &c., and inproducing said solution we use albuminous substances of grain soluble inalcohol, such as vegetable fibrin, mucedin, gliadin, and the like, eachby itself or mixed together or in connection with albumen, gelatin,collodion, or other ingredients suitable for photographic purposes. Thealbuminous substances are used in alcohol solution and may be depositedupon the paper either suitably salted and afterward sensitized, or thesubstances sensitive to light may beemulsified in the solution ofalbuminous substances in the following manner: The albuminous sub stanceis dissolved in alcohol, salted in the usual way with a haloid, and asolution of silver salt in a thin steam afterward added thereto, wherebythe silver haloid salt produced will be uniformly emulsified. Theaddition of an organic acid and that of a substance which makes thepaper pliantsuch as glycerin,castor-oil, and the likeis desirable. Themethod described may be used cold or warm, the order of the additionsmay be varied at will, and the finished emulsion is used for theproduction of the plates, paper, or diapositive in the usual manner. Thepaper thus produced besides being brought into the market completelyready for use and remaining good for months has the advantage of beinghighly sensitive, superseding in this respect albumen-paper and beingequal to the best collodion-paper. The picture produced on the paper orplates will not change even if strongly exposed to the sun, retains thewhite parts perfectly pure, and is not liable to turn yellow.

Compared with the papers hitherto known, particularly with thecollodion-papers, our improved paper has the advantage that the film,which is sensitive to light, cannot be easily scratched, and comparedwith the gelatin-paper that the same even at a high temperature will notblister in the bath. The improved paper permits also of being treated inthe bath in quantities, as the same is not liable to roll or otherwisechange undesirably. The treatment of the paper is most simple, as thesame can be toned 0d rapidly and properly in any bath without having toprepare the bath specially, as is the case when using otheremulsion-papers, and the consumption of gold is very small. The paperrequires also no special attention in the toning-bath, as it can beexceedingly easily toned off and fixed. The pictures obtained after thetoning off and fixing are extraordinarily sharp. The dark parts showextraordinary beauty, and the light parts are particularly clear.

We claim 1. A solution for the preparation of sensitive photographicsurfaces, consisting of an alcoholic solution of the albuminoussubstances of grain, said solution containing a haloid salt.

2. A solution for the preparation of sensitive photographic surfaces,consisting of an alcoholic solution of the albuminous substances ofgrain, said solution containing a silver haloid salt.

In witness whereof we have hereunto set our hands in presence of twowitnesses.

MAX J OLLES.

LEON LTLIENFELD.

Witnesses:

HARRY BELMONT, KARL I-IiiTTER.

